Cited by 560Paleontology and Stratigraphy of FossilsPaleontology and Evolutionary BiologyEvolution and Paleontology Studies

Biomat-related lifestyles in the Precambrian

Seilacher, Adolf·1999·PALAIOS

Abstract

Abstract The strange biota of Neoproterozoic sea bottoms become more understandable if we assume that otherwise soft sediments were sealed by firm and erosion-resistant biomats. This allowed "mat encrusters" (vendobionts; trilobozoan and other sponges) to get attached to sandy bottoms, and molluscan "mat scratchers" to scrape off an algal film, as if they were living on rocks. Minute conical "mat stickers" (Cloudina) probably required a sticky substrate to become stabilized in upright position. Horizontal burrows are interpreted as the works of worm-like "undermat miners." Only the latter lifestyle appears to go back to the Mesoproterozoic; the others emerged in Vendian times and virtually disappeared when matgrounds became restricted to hostile environments in the wake of the Cambrian ecological revolution.

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Crossref · 10.2307/3515363

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  • During the Neoproterozoic, macroscopic life was largely limited to benthic habitats; skeletons and sclerotized mouthparts began to evolve toward the end of this era.

    “During the Neoproterozoic, macroscopic life was largely limited to benthic habitats ( e.g. Seilacher 1999); skeletons and sclerotized mouthparts began to evolve toward the end of this era.”

    From Palaeozoic evolution of animal mouthparts (2017) · cites this paper as Seilacher 1999

  • The trace-fossil record points to two major evolutionary breakthroughs: the Fortunian diversification event and the Cambrian Stage 2 agronomic revolution that marks the establishment of a Phanerozoic-style ecology.

    “Underdetailedscrutiny, the trace-fossil record clearly points to two majorevolutionary breakthroughs-theFortuniandiversification event, and the Cambrian Stage 2 agronomic revolution that marks the establishment of a Phanerozoic-style ecology [40]”
  • Kimberella was preserved in place while grazing on substrate microbial mats.

    “These findings suggest that Kimberella was preserved in place while grazing on substrate microbial mats (Seilacher 1999; Gehling et al. 2005).”
  • The absence of arthropod scratch marks is not too worrisome because such traces would demand sclerotized appendages to cut through microbial mats, a character not necessitated by stem-group panarthropods or deeply nested stem-group arthropods in Ediacaran sediments.

    “The absence of arthropod scratch marks (Seilacher 1999), though, is not too worrisome given that such traces would demand the presence of sclerotized appendages to cut through the ubiquitously present microbial mats, a character not necessitated by the presence of stemgroup panarthropods, or even deeply nested stemgroup arthropods, in Ediacaran-aged sediments.”
  • Kimberella appears at least 10-15 million years before the Cambrian Explosion but millions of years after the Doushantuo, was a fairly large bilaterian possibly as long as 14 cm, and likely made its living by scratching sea floor microbial mats with a radula or radula-like structure.

    “Kimberella, which as discussed above appears at least some 10 -15 million years before the”

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Authors
Seilacher, A.
Affiliations
University of Tübingen (DE)
Corresponding author
Seilacher, Adolf
Venue
PALAIOS
Published
1999-02-01
Volume
14
Issue
1
Pages
86-93
ISSN
  • 0883-1351 (ISSN-L)
  • 1938-5323
OpenAlex
W2098543064
Cited by
560
References
5
Citations by year
2026: 13 · 2025: 28 · 2024: 29 · 2023: 22 · 2022: 19 · 2021: 28 · 2020: 21 · 2019: 19 · 2018: 21 · 2017: 26 · 2016: 15 · 2015: 22 · 2014: 28 · 2013: 24 · 2012: 28
FWCI
10.06
Type
journal article
Language
en
Open access
closed
Locations
Palaios (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords
biomat, Neoproterozoic, Ediacaran, sponges, Cloudina

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